<template>
  <div class="add-role">
    <header class="add-header">
      <div class="left">
        <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>

        <span>|</span>

        <span>添加角色</span>

      </div>

      <div class="right">
        黑马程序员
      </div>

    </header>

    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="activeStep">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>

      </div>

      <div v-show="activeStep === 1" class="form-container">
        <div class="title">角色信息</div>

        <div class="form">
          <el-form ref="roleForm" class="form-box" :model="roleForm" :rules="roleRules">
            <el-form-item label="角色名称" prop="roleName">
              <el-input v-model="roleForm.roleName" />
            </el-form-item>

            <el-form-item label="角色描述">
              <el-input v-model="roleForm.remark" />
            </el-form-item>

          </el-form>
        </div>

      </div>

      <div v-show="activeStep === 2" class="form-container">
        <div class="title">权限配置</div>

        <div class="form">
          <div class="tree-wrapper">
            <div v-for="item in treeList" :key="item.id" class="tree-item">
              <div class="tree-title">{{ item.title }}</div>

              <el-tree
                ref="tree"
                :data="item.children"
                show-checkbox
                default-expand-all
                node-key="id"
                highlight-current
                :props="{ label: 'title' }"
                check-strictly
              />
            </div>

          </div>
        </div>

      </div>

      <div v-show="activeStep === 3" class="form-container">
        <div class="title">检查并完成</div>

        <div class="form">
          <div class="info">
            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>

            <div class="form-item">角色描述：{{ roleForm.remark }}</div>

            <div class="form-item">角色权限：</div>

            <div class="tree-wrapper">
              <div v-for="item in disableTreeList" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>

                <el-tree
                  ref="disabledTree"
                  :data="item.children"
                  show-checkbox
                  default-expand-all
                  node-key="id"
                  :highlight-current="false"
                  :props="{ label: 'title'}"
                  check-strictly
                />
              </div>

            </div>

          </div>

        </div>
      </div>

    </main>

    <footer class="add-footer">
      <div class="btn-container">
        <el-button v-if="activeStep > 1" @click="decreseStep">上一步</el-button>

        <el-button v-if="activeStep <3" type="primary" @click="increseStep">下一步</el-button>
        <el-button v-if="activeStep === 3" type="primary" @click="confirmAdd">确认添加</el-button>

      </div>

    </footer>

  </div>

</template>

<script>
import { getTreeListAPI } from '@/api/permission'
import { createRoleUserAPI } from '@/api/role'
// 处理禁用函数
export function addDisabled(treeList) {
  treeList.forEach(item => {
    item.disabled = true
    // 递归处理
    if (item.children && item.children.length > 0) {
      addDisabled(item.children)
    }
  })
}
export default {
  data() {
    return {
      disableTreeList: [], // 新增属性，用于存储禁用状态的树形列表
      treeList: [], // 权限树形列表
      activeStep: 1,
      roleForm: {
        roleName: '',
        remark: '',
        perms: []
      },
      roleRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ]
      }
    }
  },
  mounted() {
    // 在初始化时候就加载好
    this.getTreeList()
  },
  methods: {
    decreseStep() {
      if (this.activeStep === 1) return
      this.activeStep--
    },
    increseStep() {
      if (this.activeStep === 3) return
      if (this.activeStep === 1) {
        this.$refs.roleForm.validate(async valid => {
          if (!valid) return

          this.activeStep++
        })
      } else if (this.activeStep === 2) {
        // 当前是权限信息状态
        // this.roleForm.perms = []
        // 构造接口要求的数组格式二维数组：[[］，[]]
        this.$refs.tree.forEach((tree) => {
          this.roleForm.perms.push(tree.getCheckedKeys())
        })
        // 如果长度为零没有选中任何东西，flat将二维数组转换成一维数组
        if (this.roleForm.perms.flat().length === 0) {
          this.$message.error('请至少选择一个权限点')
        } else {
          this.activeStep++
          // 回填已选择数据
          this.$refs.disabledTree.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index])
          })
        }
      }
    },
    async getTreeList() {
      const res = await getTreeListAPI()
      this.treeList = res.data
      // treeList 和 disableTreeList 都是基于 res.data 初始化的。
      // 如果不使用深拷贝，disableTreeList 和 treeList 将共享相同的嵌套对象引用。
      // 当你对 disableTreeList 进行修改（如添加禁用状态），这些修改也会影响到 treeList
      this.disableTreeList = JSON.parse(JSON.stringify(res.data))
      // 处理禁用
      addDisabled(this.disableTreeList)
    },
    async confirmAdd() {
      await createRoleUserAPI(
        this.roleForm
      )
      this.$message({
        type: 'success',
        message: '添加角色成功'
      })
      this.$router.back()
    }
  }

}
</script>

<style scoped lang="scss">
.add-role {
  background-color: #f4f6f8;
  height: 100vh;

  .add-header {
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    height: 64px;
    line-height: 64px;
    font-size: 16px;
    font-weight: bold;
    background-color: #fff;

    .left {
      span {
        margin-right: 4px;
      }

      .arrow {
        cursor: pointer;
      }
    }

    .right {
      text-align: right;
    }
  }

  .add-main {
    position: fixed;
    top: 64px;
    bottom: 88px;
    width: 100%;
    overflow-y: auto;
    background: #f4f6f8;
    padding: 20px 230px;
    display: flex;
    .step-container {
      height: 400px;
      width: 200px;
    }
    .form-container {
      flex:1;
      background-color: #fff;
      overflow-y: auto;
      .title {
        height: 60px;
        line-height: 60px;
        padding-left: 20px;
      }
      .form {
        margin-bottom: 20px;
        padding: 20px 65px 24px;
        .el-form {
          display: flex;
          flex-wrap: wrap;
        }
        .info{
          font-size:14px;
          color:#666;
          .form-item{
            margin-bottom:20px;
          }
        }
      }
      .form-box{
        width: 600px;
        display: flex;
        flex-direction: column;
      }
    }
  }

  .add-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 24px 50px;
    color: #000000d9;
    font-size: 14px;
    background: #fff;
    text-align: center;
    z-index: 10001;
  }
  .tree-wrapper {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      .tree-item {
        flex: 1;
        padding: 0px 4px;
        text-align: center;
        .tree-title {
          background: #f5f7fa;
          text-align: center;
          padding: 10px 0;
          margin-bottom: 12px;
        }
      }
    }
}
</style>
